Push-button switch.



E. D. STALFORT.

' PUSH BUTTON SWITGE.

urmourmx IILED smear. 14. mo.

'P tented May 9, 1911.

m W m no IEDXVIN D. STALFORT; OF BALTIMOBE, MARYLAND.

PUSH-BUTTON SWITCH.

Specification Letters Patent.

Application filed September 14, 1910. Serial No. 581.997.

Another ohjeet of the invention is the provision of a push hutton switehineluding at ratehet or star wheel eontart. whiehhas alternate teethtlanlted with insulation so as to rais .h-s fixed eontaet eofiperatiugwith the wheel out of engagement therewith h v eat-h alternate step inthe movement thereof 50 as to sueees ively open and (lose the (it'- euith v sueeessively pressing the hutton whieh operates to eoutrol thewheel.

With these ohjeets in view and others, as a will appear as thedeseription proceeds. t

invention comprises the various novel features of eonstruetion and:trnmgement of parts whieh will he more fully deserihed hereinafter andset forth with partieularit) in the elaiuts appended hereto.

tn the aeeompauyingz drawing. whit-h illu trates one emhmlitnent of theinvention.

Figure l is a eeutral vertieal seetion of the wit h. Fig. 2 is a planview thereof with the eovei' removed. a'iew of the malte or hreakratehet wheel or uzm'ahle eontaet element. Figs. -t and 5 are detailviews. :dmwiu; the position of the.

parts when the eireuit is open and elo etl.

Similar rehren e eharm-ters are ent- 311(1).("l to din-agitate t-tirregmn liug parts throughout the H'Yl-l'itl "it\\' I f l l l l i Fig. I-is. a perspeetive i standard (3 fastened to the base. or hottotn of thecasing. The free end of the contaet 2 is adapted to ride. on the teethof the lnov; ahle eontaet and therehy close the .eircuit. The postandavle are preferably of metal and at the has-e of the post the othereireuit;

wire 7 is conneeted. v

Extending transversel across'the top of the casing and located lat-tweenthe eontaet wheel and inner end of the push button is a spr ng: paw] Ffastened at 9 t0 the casing, one end of the leaf spring forming the pawlbeing bent downwardly so that the free end thereof will engage thecontaet wheel. The spring pawl holds the push hutton normally outwardand when the button is pushed inwardly the spring yields and causes thecontaet wheel to move one tooth. The spring contact 2 not only forms aconductor for current hut operates as a hack aeting or hold back pawl,for preventing the eontact wheel from movin; reverselv as the springpawl returns to normal position when the pressure on the push hutton isrelieved.

Fastened to one side of the eontaet wheel sulation. The alternate teeth11 of this insnlation are raised above the correspondingi, i teeth ofthe eontaet, wheel. while. the intermediate teeth 12 are flush with theadjacent teeth of the contaet wheel.

The effect of I this is that as the rotary element of the switeh turnsstep-hy-step the spring contact; 2 will eontplete the. eircuit: when itengages the teeth of the. metal section of the element that. are flushwith the insulation and open the eireuit when it engages the teeth oftho insulation raised ahove the metal seetion of ltet'erriug to thedrawing designates a 1 asing made of pfll 'tlttlll or ulllt'tuitahhinsulatin; material and ennstrtzeted in an 3 .-ituple manner. Inthe top of the easing is a deserihed the prineiple of operation of theand is adapt d to he pushed inwardly in rotates on an axle 5 set-tiredto a 'iosl or tended hereto.

the element. it will thus he seen that the eireuit is made, and hrolt'enhv a single element that is moved one step eat-h time the hutton of theswitch is pressed.

From the foregoing deseription. taken in invention. together with thedevice which I now consider to he the best embodiment, thereof, I desireto have it understood that th d viee shown is merely illustrative, andthat sut-h ehanges may he. made when desired as are wi hin the seope ofthe. elaims ap- Ia tenied May 9, 1911.

Having thus described the invention what is claimed as new, is

1'. In a switch, the combination of a rotary element including metal andinsuiation sections each formed with ratchet teeth, the alternate teethon the insulation section being raised above the corresponding teethupon the metal section, a spring contact arranged to engage alternatelya tooth of one section and a tooth of the other section as the element'is moved stepby-step, and an actuator arranged to engage the teethof the element to turn the same step-by-step.

2. A switch comprising a rotatable element in the form of a ratchetwheel formed of conducting and non-conducting parts, the alternate teethof the non,condncting part being raised above the corresponding teeth ofthe conducting part, a contact spring arranged. to engage the teeth ofthe element to complete and break the circuit by the alternateengagement of the teeth of the conductin and non-conducting parts, saidspring being arranged to form a hold back pawl, and an actuating pawlarranged to engage the teeth of the said element to turn the samestep-by-step. v a

. 3. A switch comprising a rotatable ele- .ment in the form of a ratchetwheel formed of conducting and non-conducting parts, the alternate teethof the non-conducting part being raised above the corresponding teeth ofthe conducting part, a contactsprmg arranged to engage the teeth of theelement to complete and break the circuit by the alternate-engagement ofthe teeth of the conducting and non-conducting part-s, said spring beingarranged to form a hold back pawl,

an actuating pawl arranged to engage the teeth of the said element toturn thesame ing the last mentioned pawl.

4. In. a switch, the combination of a casing, a rotating element mountedtherein and consisting of toothed conducting and non conducting parts,the alternate teeth of the non-conducting parts being raised above thecorresponding teeth of the conducting part, means for connecting theconducting part to the circuit, a spring contact engaging the element toform a pawl and adap ed to complete the circuit by contact with theco'nr noting part and to break the circuit by contact with the raisedteeth of the non-conducting part, a spring arranged within the easingand forming a pawl for engaging with and turning the said clementstep-by-step,

and a pnsh'button arranged to operate w. R. FAHLiJR, W. J. MURRAY.

40, step-by-step, and a push button ir-r operat-

